S. Bottrell, D. Lowe, J. Gunn & S. Worthington write: We read with interest the hydrogeological analysis of the thermal waters rising from Dinantian limestones in Derbyshire presented by Brassington (2007) and note the similarities to a similar analysis by Gunn et al. (2006). Their analysis of deep thermal groundwater flows used similar geological reasoning and arrived at rather similar overall conclusions and a closely comparable conceptual model. The flow paths suggested in both works that are derived on a geological basis are confirmed by consideration of new data on sulphate stable isotopes (δ34S and δ...

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